Flight plan management in a distributed air traffic control system

We explore how large-scale replication may enhance the availability of data in a loosely coupled distributed system. We are especially concerned with Air Traac Control systems which are intrinsically geographically distributed and impose strict constraints of availability. In this framework, we propose a replication system providing a weak consistency of data. After a study of speciic properties of ight plan data, we discuss possible replication strategies and present our own approach , which is characterized by a split between the propagation function and the end-user service.